Cone Zones / Road Closures - City of Longmont

Cone Zones / Road Closures

Map of Traffic Impacts and Road Closures

This map shows current, significant traffic closures submitted to and approved by the City of Longmont. Closures may be due to municipal projects, maintenance/improvement activities and/or special events.

 

Not all cone zones are included on this map since some may have a short duration or be in an area of minimal impact. If you have any questions, please contact Transportation.

View Cone Zones

View road closures and cone zones

Traffic Impacts and Road Closures

The traffic-related news alerts listed below provide a highlight of the most recent traffic closures submitted to and approved by the City of Longmont.

Construction Starting March 11 at the 3rd Avenue/Atwood Street Railroad Crossing
Construction Starting March 11 at the 3rd Avenue/Atwood Street Railroad Crossing
March 4, 2026
Post Office Driveway Entrance Closed Aug. 14 Evening – Aug. 18 Morning 
Post Office Driveway Entrance Closed Aug. 14 Evening – Aug. 18 Morning 
August 8, 2025
One-Way Traffic and Driveway Closures Scheduled on Coffman Street August 7–8 and 15–16 
July 31, 2025
Three-Day Traffic Shift at the Intersection of Coffman Street and 3rd Avenue Starting July 28
July 25, 2025
Post Office Public Parking Lot Access from Coffman Street Closed July 8
July 2, 2025
Traffic Impacts at the Intersection of Coffman Street  and 5th Avenue West of Coffman Street  
June 30, 2025
View News
Additional Resources

Longmont Trails Status Map

Boulder County Transportation: Closures and Construction

Colorado Department of Transportation: COTrip
search